焦点寸法によるX線照射野の違い

概要

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X-ray tube assemblies with a 12-degree target angle have increased. We examined the dimensions of the x-ray field and the x-ray intensity distribution according to differences in the focal spot size of the same x-ray source assembly. In the dosemeter method and x-ray film method, the optimal object field of the x-ray source assembly by which a small focal spot touches a large spot on the anode side was almost the same. With the x-ray source assembly that was examined at this time, the range of a uniform x-ray intensity distribution to the displacement point of a small focal spot was wider than that of a large focal spot. The dimension of the x-ray filed on the anode side on the X-axis were determined by the target angle, regardless of the position of the focal spot. Differences in the dimensions of the x-ray field as affected by differences in the focal spot size differences in the x-ray intensity distribution occurred on the cathode side. These differences existed because of the size and position of the focal spot. Therefore, it it necessary to understand the x-ray field of each x-ray source assembly in order to radiography.
公益社団法人日本放射線技術学会の論文
1998-12-20